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Q. I see yellow tomatoes, among other exotic types, at vegetable stores. Do they differ in nutritional value from red tomatoes? A. Like all vegetables, tomatoes differ somewhat in nutritional value from variety to variety, and even from season to season. For example, the United States Department...

LEAD: THE notion that various foods and nutrients can boost resistance to disease is one of the main tenets of popular but pseudoscientific nutritional theories. It is hardly surprising that desperate people are drawn to dietary advice purporting to cure such stubborn disorders as yeast infections...

THE industry calls its product ''the incredible, edible egg.'' But in the last three decades, eggs have been notable more for their growing unpopularity, having fallen victim to a cholesterol-conscious society that rarely sits down to a traditional family breakfast. Since 1945, when the...

NUTRITIONAL scientists once assumed that if a food contained a good deal of a particular nutrient it was a good dietary source of that nutrient. This undoubtedly accounted for the reputation of spinach as a food rich in iron and calcium that children should eat if they want to be strong. In...

EVERYWHERE you turn these days, some advertisement is pushing vitamin supplements for someone: for the drinker, the smoker, the athlete, the dieter, the woman who's pregnant or taking birth control pills, the finicky youngster, the stress-ridden executive, the tired housewife, the budget-squeezed...

Jane E. Brody, a science reporter for The New York Times, is the author of ''Jane Brody's Nutrition Book,'' which will be published this week. By Jane E. Brody was waiting for a drink at an office water fountain while a young man swallowed not one, not two, but six different pills and capsules....